Home / 904.20-1,356.36-287.88

Finding the Fourth Proportional to 904.20, 1,356.36 and 287.88

Calculator

Solution

The fourth proportional to 904.20, 1,356.36 and 287.88 is: 431.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.20 : 1,356.36 = 287.88 : x
  2. Step 2: Convert to fraction form
    904.20/1,356.36 = 287.88/x
  3. Step 3: Cross multiply
    904.20x = 1,356.36 × 287.88
  4. Step 4: Simplify right side
    904.20x = 390,468.92
  5. Step 5: Solve for x
    x = 390,468.92/904.20
  6. Step 6: Final answer
    x = 431.84

Related Problems

Find fourth proportional to 452.10, 678.18 and 143.94
Half scale
Find fourth proportional to 1,808.40, 2,712.72 and 575.76
Double scale
Find fourth proportional to 905.20, 1,357.86 and 288.88
Similar ratio
Find fourth proportional to 1,356.30, 2,034.54 and 431.82
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.